Use tduffield branch of github-changelog-generator

This branch fixes a number of bugs in the changelog generator, and
supports the type of behavior that we want when generating our
changelog. There is a PR open against
upstream (skywinder/github-changelog-generator#453) to merge this
upstream.

As part of this, we can now generate the changelog on every commit.

Signed-off-by: Tom Duffield <tom@chef.io>

1 files changed, 12 insertions, 9 deletions

diff --git a/tasks/changelog.rb b/tasks/changelog.rb
index 989c43845d..5f2648bad1 100644
--- a/tasks/changelog.rb
+++ b/tasks/changelog.rb
@@ -1,26 +1,29 @@
 begin
   require "github_changelog_generator/task"
+  require "mixlib/install"
 
   namespace :changelog do
-    # Take the current changelog and move it to HISTORY.md. Removes lines that
-    # would get duplicated the next time we pull HISTORY into the CHANGELOG.
+    # Fetch the latest version from mixlib-install
+    latest_stable_version = Mixlib::Install.available_versions("chef", "stable").last
+
+    # Take the changelog from the latest stable release and put it into history.
     task :archive do
-      changelog = File.readlines("CHANGELOG.md")
-      File.open("HISTORY.md", "w+") { |f| f.write(changelog[2..-4].join("")) }
+      changelog = Net::HTTP.get(URI("https://raw.githubusercontent.com/chef/chef/v#{latest_stable_version}/CHANGELOG.md")).chomp.split("\n")
+      File.open("HISTORY.md", "w+") { |f| f.write(changelog[2..-4].join("\n")) }
     end
 
     # Run this to just update the changelog for the current release. This will
-    # take what is in History and generate a changelog of PRs between the most
-    # recent tag in HISTORY.md and HEAD.
+    # take what is in HISTORY and generate a changelog of PRs between the most
+    # recent stable version and HEAD.
     GitHubChangelogGenerator::RakeTask.new :update do |config|
-      config.future_release = Chef::VERSION
-      config.between_tags = ["v#{Chef::VERSION}"]
+      config.future_release = "v#{Chef::VERSION}"
+      config.between_tags = ["v#{latest_stable_version}", "v#{Chef::VERSION}"]
       config.max_issues = 0
       config.add_issues_wo_labels = false
       config.enhancement_labels = "enhancement,Enhancement,New Feature,Feature".split(",")
       config.bug_labels = "bug,Bug,Improvement,Upstream Bug".split(",")
       config.exclude_labels = "duplicate,question,invalid,wontfix,no_changelog,Exclude From Changelog,Question,Discussion".split(",")
-      config.header = "This changelog reflects the current state of chef's master branch on github and may not reflect the current released version of chef, which is [![Gem Version](https://badge.fury.io/rb/chef.svg)](https://badge.fury.io/rb/chef)"
+      config.header = "This changelog reflects the current state of chef's master branch on github and may not reflect the current released version of chef, which is **#{latest_stable_version}**."
     end
   end